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A passive infrared motion sensor is a security device that detects motion by looking out for the presence of infrared energy. This type of motion detector is very popular, and these devices make for an excellent addition to any security setup.
The module will output high when it detects the movement of the human or animal, otherwise, it will output low (0V). It can be placed on any digital pin to monitor the voltage from this sensor.
Infrared motion sensor module Specification:
HC-SR501-Datasheet